When Jesus sent out the Twelve in pairs to preach ahead of him, Mark reports that He gave them these instructions:
He commanded them that they should take nothing for their journey, except a staff only: no bread, no wallet, no money in their purse, 9 but to wear sandals, and not put on two tunics. 10 He said to them, “Wherever you enter into a house, stay there until you depart from there. 11 Whoever will not receive you nor hear you, as you depart from there, shake off the dust that is under your feet for a testimony against them. Assuredly, I tell you, it will be more tolerable for Sodom and Gomorrah in the day of judgment than for that city!”
Mark 6:8-11 (WEB).
Luke’s account of the same instructions on the same occasion adds only that Jesus “sent them out to preach the Kingdom of God, and to heal the sick.” Luke 6:2.
As a result of these instructions, Mark records that “They went out and preached that people should repent (metanoōsin).” Mark 6:12. Luke records that, as a result of Jesus’ instructions, the Disciples “departed, and went throughout the villages, preaching the Good News, and healing everywhere.” Thus, the Gospel (the Good News), the Kingdom of God, and repentance were all associated with each other in the Disciples’ preaching, just as they were in Jesus’ teaching (as set forth in the last posting). The Good News was still that the Kingdom of God had come near, and that the people needed to repent, in the strong sense of changing their behavior to conform to the Kingdom.